Erosion–corrosion synergism in an alumina/seawater nanofluid

Rashidi, A. M., Paknezhad, M., Moshrefi-Torbati, M. and Walsh, F.C. (2013) Erosion–corrosion synergism in an alumina/seawater nanofluid. Microfluidics and Nanofluidics, 1-8. (doi:10.1007/s10404-013-1282-x).

Abstract

Nanofluids do indeed display the desired increase in thermal conductivity. However, the presence of solid particles is known to induce erosion and its interaction with corrosion is a serious damage for all systems operated in flowing environments. Therefore, it is essential that the possible erosion–corrosion synergism is investigated prior to use of nanofluid coolants in industry. This paper describes the synergistic effect of corrosion and erosion in nanofluid of seawater plus 1 g/l Al2O3 nanoparticles with the average size of 20 nm and compared with seawater without suspended particles. Tests are conducted on low carbon steel targets, using a rotating cylinder system. It is found that the pure corrosion rate and erosion rate of carbon steel in the fluids free of nanoparticles are respectively higher (up to ~82 % ) and lower (about 11%) than the nanofluids. Unlike the effects of nano-particles on pure corrosion and net erosion, synergistic effect of erosion and corrosion in a nanofluid is much higher (up to 237%) than the base fluid. These results indicate that the presence of aggressive ions in flowing nanofluid can lead to a considerable damage.

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